Perhaps you should try some spelling variations:
dang xay » dang van, van xay
tham soc » cham soc, tham nuoc, thai son
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
soc va » hoc va, loc va, doc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang xay hoi. ((hieu va) or (hieu qua)) tham soc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xay hoi. ((hieu va) OR (hieu qua)) tham soc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xay hoi. ((hieu va) or (hieu qua)) tham soc va hanh vi cua tre*.